Air-cooled Water ChillersVariable Refrigerant Flow (VRF) technology was developedto address global concerns and the increasing complex operatingconditions today’s marketplace demands. Through tremendous investment in research and development, Hitachi is able to offerimpressive VRF systems, the Set Free range, incorporating heatpump and heat recovery versions with one of the largest capacity ranges available in the industry from 3 HP to 30 HP inclusive.